package com.cst.reggie.filter;

import com.alibaba.fastjson2.JSON;
import com.cst.reggie.common.BaseContext;
import com.cst.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author : CST
 */
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
@Component
public class LoginCheckFilter implements Filter {
    // 路径匹配支持通配符
    public static final AntPathMatcher PATH_MATCHER =new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request1= (HttpServletRequest) request;
        HttpServletResponse response1= (HttpServletResponse) response;
        // 1、获取本次请求的URI
        String requestURI = request1.getRequestURI();

        log.info("拦截到请求：{}",requestURI);
        // 定义不需要处理的请求路径
        String[] urls=new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**"
        };
        // 2、判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        // 3、如果不需要处理，则直接放行
        if (check){
            log.info("本次请求{}不需要处理 ",requestURI);
            chain.doFilter(request1,response1);
            return;
        }
        // 4、判断登录状态，如果已登录，则直接放行
        if(request1.getSession().getAttribute("employee") != null){
            log.info("用户已登录，用户id为{}",request1.getSession().getAttribute("employee"));

            Long empId = (Long)request1.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            chain.doFilter(request1,response1);
            return;
        }
        // 5、如果未登录则返回未登录结果,通过输出流向客户响应数据
        log.info("用户未登录");
        response1.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));

    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match)
                return true;
        }
        return false;
    }
}
